Article with photocatalytic film
First Claim
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1. An article comprising:
- a substrate; and
a photocatalytic film covering said substrate, said film comprising (1) a film-forming component comprising ZrO2 and SiO2 and (2) TiO2 crystals dispersed in said film-forming component, said ZrO2, said SiO2 and said TiO2 crystals respectively being in amounts of 30-60 wt %, 15-45 wt % and 25-45 wt %, based on a weight of said film.
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Abstract
The invention relates to an article having a substrate and photocatalytic film covering the substrate. This film contains (1) a film-forming component including ZrO2 and SiO2 and (2) TiO2 crystals dispersed in the film-forming component. These ZrO2, SiO2 and TiO2 crystals respectively are in amounts of 25-60 wt %, 15-50 wt % and 25-45 wt %, based on the weight of the film. The article is improved in photocatalytic activity, abrasion resistance and chemical resistance by the provision of the film.
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Citations
29 Claims
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1. An article comprising:
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a substrate; and
a photocatalytic film covering said substrate, said film comprising (1) a film-forming component comprising ZrO2 and SiO2 and (2) TiO2 crystals dispersed in said film-forming component, said ZrO2, said SiO2 and said TiO2 crystals respectively being in amounts of 30-60 wt %, 15-45 wt % and 25-45 wt %, based on a weight of said film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 29)
providing a coating liquid comprising a first raw material of said ZrO2, a second raw material of said SiO2, and a third raw material of said TiO2 crystals;
applying said coating liquid to a surface of said substrate, thereby forming thereon a precursory film; and
subjecting said precursory film to a heat treatment at a temperature of 300-700°
C., thereby turning said precursory film into said photocatalytic film.
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12. An article according to claim 11, wherein said third raw material is TiO2 crystal grains having an average grain size of not greater than 20 nm.
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13. An article according to claim 11, wherein said first raw material is zirconium chloride or zirconium nitrate.
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14. An article according to claim 1, wherein said article is produced by a process comprising:
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providing a coating liquid comprising a first raw material of said ZrO2, a second raw material of said SiO2, and a third raw material of said TiO2 crystals;
applying said coating liquid to a surface of said substrate, thereby forming thereon a precursory film; and
subjecting said precursory film to a first baking at a temperature of 560-700°
C., thereby turning said precursory film into said photocatalytic film.
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15. An article according to claim 14, wherein said substrate is a glass plate, and wherein said glass plate is bent into a curved glass plate when said precursory film and said glass plate are subjected to said first baking.
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16. An article according to claim 14, wherein said substrate is a glass plate, and wherein said glass plate is bent into a curved glass plate after said first baking.
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17. An article according to claim 14, wherein, prior to said first baking, said precursory film is subjected to a second baking at a temperature of 300-620°
- C.
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18. An article according to claim 14, wherein said third raw material is TiO2 crystal grains having an average grain size of not greater than 30 nm.
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19. An article according to claim 14, wherein said first raw material is zirconium chloride or zirconium nitrate.
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29. An article according to claim 1, wherein said ZrO2 is in amount of 30-50 wt %, based on the weight of said film.
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20. A process for producing an article, said article comprising:
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a substrate; and
a photocatalytic film covering said substrate, said film comprising (1) a film-forming component comprising ZrO2 and SiO2 and (2) TiO2 crystals dispersed in said film-forming component, said ZrO2, said SiO2 and said TiO2 crystals respectively being in amounts of 30-60 wt %, 15-45 wt % and 25-45 wt %, based on a weight of said film, said process comprising;
providing a coating liquid comprising a first raw material of said ZrO2, a second raw material of said SiO2, and a third raw material of said TiO2 crystals;
applying said coating liquid to a surface of said substrate, thereby forming thereon a precursory film; and
subjecting said precursory film to a heat treatment at a temperature of 300-700°
C., thereby turning said precursory film into said photocatalytic film.- View Dependent Claims (21, 22)
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23. A process for producing an article, said article comprising:
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a substrate; and
a photocatalytic film covering said substrate, said film comprising (1) a film-forming component comprising ZrO2 and SiO2 and (2) TiO2 crystals dispersed in said film-forming component, said ZrO2, said SiO2 and said TiO2 crystals respectively being in amounts of 30-60 wt %, 15-45 wt % and 25-45 wt %, based on a weight of said film, said process comprising;
providing a coating liquid comprising a first raw material of said ZrO2, a second raw material of said SiO2, and a third raw material of said TiO2 crystals;
applying said coating liquid to a surface of said substrate, thereby forming thereon a precursory film; and
subjecting said precursory film to a first baking at a temperature of 560-700°
C., thereby turning said precursory film into said photocatalytic film.- View Dependent Claims (24, 25, 26, 27, 28)
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Specification